3-D Mantle wedge flow pattern and seismic anisotropy: Effects of oblique subduction

GSTDTAP

项目编号	1620604
	3-D Mantle wedge flow pattern and seismic anisotropy: Effects of oblique subduction
	Ikuko Wada
主持机构	University of Minnesota-Twin Cities
项目开始年	2016
	2016-09-01
项目结束日期	2018-08-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	133694(USD)
国家	美国
语种	英语
英文摘要	This project looks to improve our understanding of the inner workings of subduction zones. The particular focus of this work on modeling the interface of two colliding plates, the mantle wedge, can help us to better understand how subduction zones are responsible for the location of volcanic arcs and how the conditions at that depth and composition can lead to earthquakes in areas like Hikurungi, Japan and the Aleutians, Alaska. The project will build a suite of 3D models and codes that The work will support a new researcher and a graduate student. Shear waves splitting measurements indicate complex variations in the seismic anisotropy of the mantle wedge among different subduction zones. Deformation in the upper mantle causes seismic anisotropy through its effect on the lattice-preferred orientation (LPO) of anisotropic minerals and shape-preferred orientation of elastically distinct material, such as fluid-filled cracks. Earlier 3-D subduction modeling studies indicate that oblique subduction, 3-D slab geometry, and margin curvature cause complex spatial variations in mantle wedge flow directions, likely generating complex shear wave splitting patterns and making the interpretation of splitting measurements difficult. In this study the researcher and graduate student will investigate the effect of 3-D mantle wedge flow patterns on the development of LPO and seismic anisotropy, focusing particularly on the role of oblique subduction. They will calculate mantle wedge flow fields for a range of subduction obliquity, slab geometry, and margin curvature. Using the calculated mantle flow field to compute LPO and shear wave splitting parameters the work will compare the calculated splitting parameter values with observation to systematically quantify the contributions of these factors to the observed anisotropic structures of mantle wedges globally.
来源学科分类	Geosciences - Earth Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/70134
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Ikuko Wada.3-D Mantle wedge flow pattern and seismic anisotropy: Effects of oblique subduction.2016.